Grate construction



4 Sheets-Sheet 1 arrfi'am Jwwo c. E. HARRISON .GRATE CONSTRUCTION Filed J ne :5, 1925 Dec. 2, 1930.

4 Sheets-Sheet 2 N l w Q m nu wm. FVWMM Dec. 2, 1930. c. E. HARRISON GRATE CONSTRUCTION Filed June 3, 1925 Dec. 2, 1930. c. E. HARRISON (mus: col'ws'muc'rlou Filed June 3, 1925 4 Sheets-Sheet s Dec. 2, 1930. c. E. HARRISON GRATE CONSTRUCTION Filed June 5, 1925 4 Sheets-Sheet 4 W 7W L VJHHF a a 7 5. M I- m 5 2m 4 a a w 1 Patented Dec. 2, 1-930 NITED. STATES PATENTEOFFICE E. HARRISON, OF PHILADELPHIA, PENNSYLVANTA, ASSIGNOR TO AMERICAN ENGINEERING COMPANY OF PHEADELPHIA, rmsymnm nrconrona'rron OF mmwsnvanm Application filed June a,

wide an extension plate with a nose piece which may be r newed whe'nda'maged by the action of the furnace without the necessity of disturbing the adjacent portion of the retorts or tuyere stacks.

Other objects and applications of myinvention, as well as details of con'structionand operation, whereby my nvention .ma

be practiced, will be apparent more fully ereinafte'r', when taken in connection with the accompanying.description, claims and drawings, wherein ig. 1 is a detail view, partially in elevation and partially in. section, of the rear end portion of a stoker construction embodying my invention;

Fig. 2 is anenlaiged top plan view'of the extensionplate of ig. 1'

Fig. 3 is a longitudinal sectional view taken on the line III-J11 of Fig. 2;

Fig. 4 is a transverse sectional view taken on the line IV-IV of Fi ."2;

Figs. 5 and 6 are top p an and side elevational views, respectively, of the base section of the extension plate;

Fig. 7 is a transverse sectional viewtaken on the line VII-VII of Fig. 5; v

Figs. 8, 9, and I'Oare top plan, side and end elevational views, respectively, of the detachable nose piece;

Figs. 11 and 12 are .top plan and side ele vational views, respectively, of a modification; and 1 Fig. 13 is a longitudinal sectional view.

taken on' the line XIIL-XIII of 11.

Referring to Fig. 1,.a rear end 1 of an underfeed stoker comprises. a supporting framework 2 which is mounted on transversely extending beams 3 and 4. The-framework 2 slidably supports an extension grate 5 actuwardly Veextendinfgr -G-R.A TE GONSTBUCTIOIF 1925. Serial No. 84,626.

ated by linkage 6 in the usual manner. The framework 2 also includes apair of spaced walls 7 and 8, the former ofwhich is. provided w1th a damper '9 for controlling the flow of air to extension grates 5 and grate support 2a. .Tuyeres 11 and extension plates 12, of which only one is shown, may be supplied with'air' from the main wind box formed bythe framework 2. The stoker comprises, the usual series of tuyeres 11 which a1 ernate with retorts 13-across the widthof t e stoker. The

extension plate 12 shown inthe drawing is of the type associated with the retorts 13,

serving as a continuation of the floor thereof,

which are supported on a member 18 carried by the framework 2. .QA. forwardmove- .ment of the'extension plate 12 is, prevented by afplate member 18a. which abuts against edge portions 161; and 17a of the flanges 16 and 17, respectively. It is noted that the rear end ofthe plate member 18a is supported on the member 18, as shown in Fig. 1. The rear end 19 of'the base'section14 is provided with a depending wall 20 which extends between side wall flanges21 and 22. These.

flanges are respectively provided with outgrooved portions 23 space rtically m the lower edge of the side wall flanges-21 and 22. The grooved side wall portlons 23 respectively interlock with adjacent extension plates (not shown) so as to prevent siftings and air leakage therebetween.

The lower edge of the wall 20' of the base section 14 is provided with an -ofi'set horizontal extension 24, a free edge 25 of which is raised as shown in Fi 3, ,for reasons as will presently appear. n under side 26 of the wall extension 24 is provided with spaced lugs 27 which rest on an upper edge 28 of the supporting, wall 7' (Fig. 1). A rearward movement of the base section 14 is prevented by lugs 29. which extend downwardly from the under side 26 of the'extension 24 so as to engage aside 31of thesupporting wall 7.

As noted above, my invention further contemplates a removable nose piece 32 for the extension plate 12, which may be readily re.- placed when damaged by the action of the furnace without disturbing the base section 14. Since the renewable nose piece 32 represents approximately one-third of the total weight of the extension plate'12, aconsiderable saving in material is thus afforded. The renewable nose 32 may take various forms as shown in the drawings. Referrin particularly to the structure disclosed in igs. 1 to 4 and 7 to 10, inclusive, the nose piece 32 comprises an upper horizontal portion 33 which is contiguous to a horizontal portion of the base section 14. v

The opposite sides of the horizontal por tion-33 of the nose piece 32 are provided with side walls 34 and 35 having-outwardly extending grooved portions 36 and 37 respectively. As illustrated in' Fig. 2,these grooved portions constitute continuations of the side wall portions 23, 23, respectively. The walls 34 and 35 may rest on the horizontal extension 24 adjacent to the opposite side thereof. A rear side 38 of the nose 32 is curved as shown, and it is prov ded with a forwardly extending section 39 adapted to engage the underside of the raised end 25 of the extension 24. A pair of spaced locking lugs 40 and 41 (Figs. 3 and 8) are formed to engage the upper slde of the raised end 25. A chamber 42, which is formed by the nose 32 and extension 24, is provided with a transversely extending slot 43 in the end portion 38 thereof whereby air entering'through spaced apertures 44 and 45 in the depending wall 20 may have an outlet and thereby facihtate the cooling of the extension plate 12. A

An upper side 46 (Figs. 3 and 5) of the horizontal extension 24 is provided with end and side ribs 4748 and 49-51, respectively,-

forming a recess 52 adapted to receive a locking key 53. The front end 54 of the nose 32 is provided with an a erture 55 thrdugh which the key'53 may recess 52. The key 53 may be provided'with a head 56 ofT-shape, whereby the sameimay be readily gripped while in the 55 by tongs or other clamping means.

9 The front end '54 is also provided a hook portion comprising a depending wall 57 i. and horizontal flange 58, said wall abutting against the end of an overhung edge portion 59 of the base section 14, and 'said flange extending beneath the same. Hence, the adj acent ends 54 and 19 of the base section 14 and the nose .32, respectively, are locked against relative vertical movement, while the 1:3 53 servesto prevent a relative longitudie inserted into the movementtherebetween. The flange .39

and' the locking lugs 40 and '41 of the nose 57-58,.of the renewab e nose 32 and this support may be supplemented by spaced ribs 60 and 61 which extend between the side rib 49 and the end wall 20, as shown in Fig. 5.

When it is desired to replace a damaged nose piece32, the key 53 is removed and the nose 32 is then moved rearwardly from the base section 14 until the portions 58 and 39 of the nose are respectively clear of the overhung edge portion 59 and the raised end portion 25 of said-base section 14, whereupon said nose piece may be lifted vertically. The reverse operation obtains when the nosepiec'e 32 is replaced. I

A renewable nose 32' disclosed in Figs. 11 to 13 is distinguishable from that just describedprincipally in the provision of an in-' clined upper wall portion 62, an under side 63 of which is provided with a hook ortion 64 adapted to extend under a shou der 65 as shown in Fig. 13 so as to parallel the under side 63 of the renewable nose.

When-it is desired to remove the nose 32',

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the key 53 is removed, as in the preceding I construction, and said nose 32"is then moved rearwardly a distance sufiicient to permit the hook portions 64 and 57'--58' to be moved clear of the adjacent portions 65 and 59 of the base section 14.

While I have shown only twoforms of embodiment ofmy invention, -for the purpose of describing the same and illustrating its principles of construction and operation, it is apparent that various changes and mo cations may be made therein without departing from the spirit of my invention'and I desire, therefore, that only such limitations shall be imposed thereon as are indicated in the appended claim or as are demanded by the prior art.

I claim: A plate extension for stoker grates comprising longitudinally detachable front and rear sections, the front section having a recess and the rear section an opening in alignment with the recess, 'a locklng pin projecting through the opening and into the recess and preventing longitudinal separation of said sections, and vertically interlocking means on said sections located in spaced relation longitudinally of the sections and respectively at opposite sides of said in.

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